John Buchan (2016). “The Complete Works of John Buchan (Unabridged): Thriller Classics, Spy Novels, Supernatural Tales, Short Stories, Poetry, Historical Works, The Great War Writings, Essays, Biographies & Memoirs – All in One Volume”, p.1672, e-artnow
Letter from the field of Waterloo in June 1815. "The Fifteen Decisive Battles of the World: From Marathon to Waterloo" by Edward Shepherd Creasy, 1851.